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   1 #ifndef _X8664_DMA_MAPPING_H
   2 #define _X8664_DMA_MAPPING_H 1
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9
  10 #include <asm/scatterlist.h>
  11 #include <asm/io.h>
  12 #include <asm/swiotlb.h>
  13
  14 struct dma_mapping_ops {
  15         int             (*mapping_error)(dma_addr_t dma_addr);
  16         void*           (*alloc_coherent)(struct device *dev, size_t size,
  17                                 dma_addr_t *dma_handle, gfp_t gfp);
  18         void            (*free_coherent)(struct device *dev, size_t size,
  19                                 void *vaddr, dma_addr_t dma_handle);
  20         dma_addr_t      (*map_single)(struct device *hwdev, void *ptr,
  21                                 size_t size, int direction);
  22         /* like map_single, but doesn't check the device mask */
  23         dma_addr_t      (*map_simple)(struct device *hwdev, char *ptr,
  24                                 size_t size, int direction);
  25         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  26                                 size_t size, int direction);
  27         void            (*sync_single_for_cpu)(struct device *hwdev,
  28                                 dma_addr_t dma_handle, size_t size,
  29                                 int direction);
  30         void            (*sync_single_for_device)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, unsigned long offset,
  35                                 size_t size, int direction);
  36         void            (*sync_single_range_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_sg_for_cpu)(struct device *hwdev,
  40                                 struct scatterlist *sg, int nelems,
  41                                 int direction);
  42         void            (*sync_sg_for_device)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  46                                 int nents, int direction);
  47         void            (*unmap_sg)(struct device *hwdev,
  48                                 struct scatterlist *sg, int nents,
  49                                 int direction);
  50         int             (*dma_supported)(struct device *hwdev, u64 mask);
  51         int             is_phys;
  52 };
  53
  54 extern dma_addr_t bad_dma_address;
  55 extern struct dma_mapping_ops* dma_ops;
  56 extern int iommu_merge;
  57
  58 static inline int dma_mapping_error(dma_addr_t dma_addr)
  59 {
  60         if (dma_ops->mapping_error)
  61                 return dma_ops->mapping_error(dma_addr);
  62
  63         return (dma_addr == bad_dma_address);
  64 }
  65
  66 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  67                                 dma_addr_t *dma_handle, gfp_t gfp);
  68 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  69                               dma_addr_t dma_handle);
  70
  71 static inline dma_addr_t
  72 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  73                int direction)
  74 {
  75         BUG_ON(!valid_dma_direction(direction));
  76         return dma_ops->map_single(hwdev, ptr, size, direction);
  77 }
  78
  79 static inline void
  80 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  81                  int direction)
  82 {
  83         BUG_ON(!valid_dma_direction(direction));
  84         dma_ops->unmap_single(dev, addr, size, direction);
  85 }
  86
  87 #define dma_map_page(dev,page,offset,size,dir) \
  88         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  89
  90 #define dma_unmap_page dma_unmap_single
  91
  92 static inline void
  93 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
  94                         size_t size, int direction)
  95 {
  96         BUG_ON(!valid_dma_direction(direction));
  97         if (dma_ops->sync_single_for_cpu)
  98                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
  99                                              direction);
 100         flush_write_buffers();
 101 }
 102
 103 static inline void
 104 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 105                            size_t size, int direction)
 106 {
 107         BUG_ON(!valid_dma_direction(direction));
 108         if (dma_ops->sync_single_for_device)
 109                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 110                                                 direction);
 111         flush_write_buffers();
 112 }
 113
 114 static inline void
 115 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 116                               unsigned long offset, size_t size, int direction)
 117 {
 118         BUG_ON(!valid_dma_direction(direction));
 119         if (dma_ops->sync_single_range_for_cpu) {
 120                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 121         }
 122
 123         flush_write_buffers();
 124 }
 125
 126 static inline void
 127 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 128                                  unsigned long offset, size_t size, int direction)
 129 {
 130         BUG_ON(!valid_dma_direction(direction));
 131         if (dma_ops->sync_single_range_for_device)
 132                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 133                                                       offset, size, direction);
 134
 135         flush_write_buffers();
 136 }
 137
 138 static inline void
 139 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 140                     int nelems, int direction)
 141 {
 142         BUG_ON(!valid_dma_direction(direction));
 143         if (dma_ops->sync_sg_for_cpu)
 144                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 145         flush_write_buffers();
 146 }
 147
 148 static inline void
 149 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 150                        int nelems, int direction)
 151 {
 152         BUG_ON(!valid_dma_direction(direction));
 153         if (dma_ops->sync_sg_for_device) {
 154                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 155         }
 156
 157         flush_write_buffers();
 158 }
 159
 160 static inline int
 161 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 162 {
 163         BUG_ON(!valid_dma_direction(direction));
 164         return dma_ops->map_sg(hwdev, sg, nents, direction);
 165 }
 166
 167 static inline void
 168 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 169              int direction)
 170 {
 171         BUG_ON(!valid_dma_direction(direction));
 172         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 173 }
 174
 175 extern int dma_supported(struct device *hwdev, u64 mask);
 176
 177 /* same for gart, swiotlb, and nommu */
 178 static inline int dma_get_cache_alignment(void)
 179 {
 180         return boot_cpu_data.x86_clflush_size;
 181 }
 182
 183 #define dma_is_consistent(h) 1
 184
 185 extern int dma_set_mask(struct device *dev, u64 mask);
 186
 187 static inline void
 188 dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
 189 {
 190         flush_write_buffers();
 191 }
 192
 193 extern struct device fallback_dev;
 194 extern int panic_on_overflow;
 195
 196 #endif /* _X8664_DMA_MAPPING_H */